Bones keeps on messing up my model?
Select the mesh and use Alt P to remove the parenting.

Select the object and (in object mode) apply rot and scale (Ctrl A - rot and scale).

Do the same with the armature object.

This is a good habit that will set your rot and scale to default (0,0,0 and 1,1,1) without modifying the objects, and it's always a must if you want to use automatic functions and addons.

Then select the mesh and (in edit mode) select all and recalculate normals (Ctrl N).

Now select the mesh, shift select the armature and press Ctrl P - with automatic weights.

This procedure leads to a better starting point, but consider that it will be very difficult to animate your model without any IK device.

Search for IK tutorials or watch the complete human rigging free course on You Tube by Nathan Vegdahl.